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29 July, 11:42

A 60 W light bulb at 120 V is left on in your house to prevent burglary, and the power charges 10 cents per kilowatt-hour, how much will it cost to leave the bulb on for 30 days?

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  1. 29 July, 11:56
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    60W x 24 hr x 30 days = 42,200 Wh = 42.2 kWh

    42.2 kWh x 0.1 = 4.22 dollars
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